CONTRACTS OF ROAD DISTRICT OR PRECINCT OPERATING UNDER ROAD BOND LAW.
Tex. TRANSP Code § 257.002.
in effect(a) A county commissioner is the ex officio road superintendent with power to enter into a contract in an amount that is not more than $50 on behalf of:
(1) a road district located in the commissioner's precinct;
(2) a justice precinct operating under Chapter 1471 , Government Code, and located in the commissioner's precinct; or
(3) the commissioner's precinct if it is operating under Chapter 1471 , Government Code.
(b) A contract made under Subsection (a) must be approved by the commissioners court.
(c) A contract in an amount that is more than $50 made on behalf of a road district or precinct described by Subsection (a) must be awarded by the commissioners court of the county in which the road district or precinct is located.
(d) The commissioners court may enter into a contract with an engineer, financial advisor, attorney, or other consultant as the court determines appropriate to act on behalf of the county or the road district or precinct.